Throttle-valve.



, PATENTED DEG. 5, 1905.1 I

R. H. WHITE. 'I'HROTTLB VALVE; APPLIOATION H'LED DB0. 5, 1904.

N d REM Wi'tazetme Y UNITED sfrATEs PATENT OEEICE.

EOLLIN H. WHITE, OE CLEVELAND, OHIO, AssIGNOE TO THE WHITE SEWING MACHINE COMPANY, OE CLEVELAND, OHIO, A CORPORA- TION OE OHIO. y

THRoTTLE-vALvE'.

Patented Dec. 5, 1905 Application filed December 5, 1904:. Serial No. 235,517.

To all whom it may concern:

. Be it known that I, ROLLIN H.WHI'IE, a citisoon become eroded "and scratched to such an extent that leakage cannot be prevented until said surfaces are reground. This is thoughtto be due to the action of wire-drawn steam and to the action of foreign particles carried by the steam between said valve and its seat when they are separated only slightly.

The primary obJect of this invention is to .provide a throttle-valve construction by whichthe iow of steam may be nicely controlled, but in which those-surfaces which by their engagement finally close the valve will not be subject to much or any wear or defacement from the causes specified, thereby rendering the necessity for regrinding said surfaces of infrequent occurrence. v

The invention may be here summarized as the construction and combination of'parts shown, described, and claimed. p In the drawings, Figure l is a central longitudinal sectional view of the throttle-valve contrivance embodying my invention, the

' valve being completely closed.V Fig. 2 isl a view, partly in section, of the cooperating ends of the valve-rodyand steam passage-way and of the valve-seat sleeve when the valve is open very wide; and Fig. 3 is a similar view of the same parts when the valve is'nearly,

but not quite, closed. y

Referring'to the parts by'letters, A represents the valve-casing, in which is the steampassage c. Preferably a hardened seat-sleeve C 1s secured 1n the Inner end of said passage,

so that it forms a continuation thereof.l The hole c, which is the steam passage-way through this sleeve, is of cylindrical form and its inner end c is countersunk to increase its diameter.

turning of the valve-rod will causeit to move endwise. yA handle D, lattached to the outer end of this rod, affords convenient means for turnlng 1t.

The inner end of this valve-rod is of conical shape, as at o. Just above that 'conical end the rod-- is cylindrical, as at b2,

and of such diameter as to be a nice sliding t to the passage-way 0. Above this is the enlarged conical valve-surface b3, which is fitted to the seat c?. The length of the cylindrical part Z22 is such that it may have a consid- When this cylindricalfpart b2 has entered the passage-,way o, rany substantial iiow of steam is prevented. i Ordinarily the volume which caniiow past the engaging cylindical surfaces will besmall-a mere leakage. This leakage may, however, ybe prevented by screwing the valve-rod B down until the conical surface b3 engages with the lvalve-seat o2. To open the valve eectively, the rod B must be moved up until the cylindrical part b2 is entirely withdrawn from the hole o. The size of the opening for the steam to Ilow through is determined by the distance between the conical 4surface I2 and the edge ofthe passage-way c,

and-this distance may. be varied at will by turning thevalve-.rod B. At all times, however, when the valve is Open, as stated, this distance will be less than the distance between erable movement intothe passage-way before the conical surface b3 engages with the seat o2.

the valve-seat o2 and the conical valve-surface .V There may be some erosion and scratch- -ing of Ythe conical end b and the edge of the passage-way@ and of the cylindrical surface of the part b2 andof the wall of the passageway o; but that is of no consequence, because it will loe lon-g before there isany substantial wear of the surfaces o2 and b3, which by their engagement are intended to shut off entirely the iiow of steam. The .throttle-valve contrivance shown is designedwith a view to securing certain minor advantages due to the features of construction now to be described. The valve-casing is made of two parts A and A', the latter telescoping into the former and having an external flange a2. A coupling-nut J screws onto the part A and, engaging with the iiange c2, holds the two parts together, but in such a Way as to permit their easy separation. n

An arm E is clamped upon the casing mem? ber A', and a plate F has a hole which loosely embraces the end e of the arm E, which end IOO is parallel With the valve-rod. This plate also loosely embraces the valve-rod and bears upon the hub CZ of the handle D. A spring-Washer Gr bears upon the plate F, and its pressure is regulated by a nut H, which screws onto a cylindrical prolongation of said hub d. By

turningl this nut the tension of the spring- Washer may be varied. The purpose of this spring-Washer and the described cooperating parts is to hold the valve against accidental movement from any position into which it may be moved.

Having described my invention, I claim-- l. The combination of a valve-casing having a cylindrical steam passage-way Whose inner end is countersunk and has on the inner edge of said countersunk portion a valve-seat, with an endWise-movable valve-rod alined With said passage-way, and having, first, a conical end, second, a larger conical surface for engaging said valve-seat, and,third, a cylindrical portion which lies between said conical portions and is fitted to the cylindrical steam passage-way and is long enough to adapty it to enter said passageway an appreciable distance before the larger conical surface engages vvithA said valve-seat.

2. The combination ofavalve-casinghaving a cylindrical steam passage-way Whose innei end is countersunk and has on the inner edge of said countersunk portion a valve-seat, with an endwise-movablevalve-rod alined with said 3. In a throttle-valve the combination of a valve-casing having an internally-threaded portion, a valve-rod having a threaded portion which engages with the said threaded part of the casing and having a stem which projects voutof the easing, an operating-handle secured to the said stem, a nou-rotatable plate resting upon the hub of said handle, a spring-washer bearing upon said plate, and means for regulating the tension of the washer.

4. In a throttle-valve the combination of a valve-easing having an internally-threaded portion, a valve-rod having a thread ed portion which engages with the threaded portion of the casing and having a stem which projects out of the casing, an operating-handle secured to said stem, an arm E fixed to the casing and having its outer end lying` parallel with the valve-rod, a plate loosely embracing the valverod and having a hole which also loosely elnbraces the end of said rod E, which plate bears upon the hub of said operating-handle, a spring-washer bearing upon said plate, and a nut which screws onto the hub of thc operating-handle and bears against said spring- .washer to regulate its tension.

5. The combination of a valve-casing coniposed of the part A containing asteam-passage and a telescoping part A' having an outwardlyextended flange which bears against thc end of the part A, and having also an internallythreaded portion a', a coupling-nut J engaging with said flange and screwing onto the casing part A, and a valve-rod B entering the casing and havinga threaded portion b which engages with the internally-threaded part of the casing member A.

In testimony whereof I hereunto aiiix my signature in the presence of two witnesses.

ROLLIN H. WHITE.

Witnesses:

E. B. GILoHRIsT, E. L. THURs'roN. 

